Men, cut off your balls.
In a study published this week in Current Biology, Min and others analyzed historical data on lifespans of men in Korea. Apparently, back in the day, emperors would adopt eunuchs (men castrated before puberty) to live with and work with them. What better way to prevent the staff from sleeping with your family members? Well, it turns out, men without testes live 15 years longer, on average, than men with testes of similar socio-economic status. It seems that testosterone just isn’t that good for you. So, if you want to live longer, just cut your balls off.